linux-kernel - [PATCH 4.4 56/87] ipv6: fix possible mem leaks in ipv6_make

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Message-Id: <20180115123355.196831336@linuxfoundation.org>
Date:   Mon, 15 Jan 2018 13:34:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        Vlad Yasevich <vyasevich@...il.com>,
        Mike Maloney <maloney@...gle.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 56/87] ipv6: fix possible mem leaks in ipv6_make_skb()

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <edumazet@...gle.com>


[ Upstream commit 862c03ee1deb7e19e0f9931682e0294ecd1fcaf9 ]

ip6_setup_cork() might return an error, while memory allocations have
been done and must be rolled back.

Fixes: 6422398c2ab0 ("ipv6: introduce ipv6_make_skb")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Vlad Yasevich <vyasevich@...il.com>
Reported-by: Mike Maloney <maloney@...gle.com>
Acked-by:  Mike Maloney <maloney@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/ip6_output.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1785,8 +1785,10 @@ struct sk_buff *ip6_make_skb(struct sock
 	cork.base.opt = NULL;
 	v6_cork.opt = NULL;
 	err = ip6_setup_cork(sk, &cork, &v6_cork, hlimit, tclass, opt, rt, fl6);
-	if (err)
+	if (err) {
+		ip6_cork_release(&cork, &v6_cork);
 		return ERR_PTR(err);
+	}
 
 	if (dontfrag < 0)
 		dontfrag = inet6_sk(sk)->dontfrag;